code: def test_unknown_vendor(self) -> None:
      with pytest.raises(ValueError):
          bt.get_provider("This is not a valid tile vendor")
  
imports: from __future__ import annotations
  import pytest
  import xyzservices.providers
  from bokeh.models import WMTSTileSource
  import bokeh.tile_providers
label_desc: Use image node_id 2 for calling the Test_GetProvider obj's underlying member method code with example usage: obj.test_unknown_vendor() without return types